Where does “enclosure” come from?

Enclosure comes from Old French enclosure, a noun derived from the verb enclore meaning to shut in or confine.

enclosure (English): Something enclosed, i.e. inserted into a letter...

Definitions

Step	Language	Word	Meaning
1	Old French	enclosure	enclosure
2	Old French	enclore	to enclose; to include
3	Latin	inclūdere	—
4	Proto-Indo-European	(s)kleh₂w-	a hook, crook, peg
5	Proto-Indo-European	(s)kel-	to bend, crook; bent, crooked; leg, heel, knee,...

enclosure — Etymology, Origin & Word History | Etymology Explorer